On Wed, 2010-07-07 at 10:09 -0700, Mark Christooph wrote:
> I had an interesting dilemma recently and I'm wondering if anyone here can
> illuminate on why this happened.
>
> I have a number of pools, including the root pool, in on-board disks on the
> server. I also have one pool on a SAN disk, outside the system. Last night
> the SAN crashed, and shortly thereafter, the ZFS system executed a number of
> cron jobs, most of which involved running functions on the pool that was on
> the SAN. This caused a number of problems, most notably that when the SAN
> eventually came up, those cron jobs finished, and then crashed the system
> again.
>
> Only by [i]zfs destroy[/i] on the newly created zfs file system that the cron
> jobs created was the system able to boot up again. As long as those corrupted
> zfs file systems remained on the SAN disk, not even the rpool would boot up
> correctly. None of the zfs file systems would mount, and most services were
> disabled. Once I destroyed the newly created zfs file systems, everything
> instantly mounted and all services started.
>
> Question: why would those one zfs file systems prevent ALL pools from
> mounting, even when they are on different disks and file systems, and prevent
> all services from starting? I thought ZFS was more resistant to this sort of
> thing. I will have to edit my scripts and add SAN-checking to make sure it is
> up before they execute to prevent this from happening again. Luckily I still
> had all the raw data that the cron jobs were working with, so I was able to
> quickly re-create what the cron jobs did originally. Although this happened
> with Solaris 10, perhaps the discussion could be applicable to OpenSolaris as
> well (I use both).
This sounds like a bug. It would certainly be informative to see the
backtrace of the panic from your logs. Also, it would be more
informative if you were seeing this problem on OpenSolaris. Many of us
will not be able to do much with a Solaris 10 backtrace, since we don't
have access to S10 sources.
- Garrett
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